Bug 1250 - Backlight/Brightness doesn't work on Packard Bell EasyNote TE11HC-B8302G50Mnks
: Backlight/Brightness doesn't work on Packard Bell EasyNote TE11HC-B8302G50Mnks
Product: Desktop Bugs
Classification: ROSA Desktop
Component: Hardware
: Fresh
: All Linux
: Normal normal
: ---
Assigned To: Groups for solving hardware issues.
: Eugene Shatokhin
Depends on:
  Show dependency treegraph
Reported: 2012-12-16 16:00 MSK by altadeos
Modified: 2015-04-03 10:20 MSD (History)
4 users (show)

See Also:
RPM Package:
Bad POT generating:

lspci (3.54 KB, text/plain)
2012-12-16 21:29 MSK, altadeos
lsusb (337 bytes, text/plain)
2012-12-16 21:30 MSK, altadeos
dmesg (53.48 KB, text/plain)
2012-12-16 21:30 MSK, altadeos

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Description altadeos 2012-12-16 16:00:13 MSK
Description of problem:
The FN-F11 and FN-F12 combinaisons doesn't work to adjust brightness of screen.
When you push this combinaisons nothing happens.

Version-Release number of selected component (if applicable):
Rosa Desktop 2012 RC and Rosa Marathon LTS

How reproducible:
boot the computer and try to adjust brightness

Steps to Reproduce:
1. boot the computer
2. when your are in your session try to set brightness up or down with FN-F11 or FN-F12 combinaisons
3. nothing happens

To have a functionnal brightness adjustment you need to put acpi_osi=Linux acpi_backlight=vendor on the grub line with mcc.
After a reboot all is ok, you can set brightness up or down with button combo.

Could someone please make it automatic or perhaps there is a bug?
Comment 1 altadeos 2012-12-16 21:29:30 MSK
Created attachment 923 [details]
Comment 2 altadeos 2012-12-16 21:30:04 MSK
Created attachment 924 [details]
Comment 3 altadeos 2012-12-16 21:30:36 MSK
Created attachment 925 [details]
Comment 4 altadeos 2012-12-21 01:56:50 MSK
Hello, i can confirm that the bug is also present with the final release of Rosa fresh.
Comment 5 Aleksandr Kazantcev 2012-12-21 02:11:28 MSK
It's not be automate because this is custom solution. Only in FAQ or Errata...

Grub line for common users will be empty and one solution - use udev detect rules and fix this in kernel (grub transfer kernel this params). For some reason both not implements :(
Comment 6 altadeos 2012-12-21 12:30:12 MSK
Thanks for the answer. So it cannot be automated and perhaps it needs to be implemented/corrected directly in the kernel?
Is there a way to report it to upstream or could someone can do it for me please?
How can i add the workaround information on the errata page?
It can be usefull for other users that doesn't know this solution for this computer model and other acer laptop.
For me it is not a problem because i know what to do but for other users it can be a problem.
I have see that a lot of linux distributions have this "problem".
The only negative point is that if you can't adjust brightness you loose battery autonomy faster but it not a blocking bug.

Comment 7 Aleksandr Kazantcev 2012-12-21 14:16:43 MSK
You may register on our wiki (wiki.rosalab.ru/en) and add information in ERRATA page.
Comment 8 altadeos 2012-12-21 17:22:50 MSK
Hello, i have edited the wiki page. If something is wrong could someone please correct it?
Comment 9 Denis Silakov 2012-12-22 20:10:06 MSK
Thanks a lot, I've only fixed a typo and usage of French words instead of English ones:) And translated this note to Russian.
Comment 10 altadeos 2012-12-24 00:15:26 MSK
I set to wontfix because it's a mainstream bug, a workaround exists and i added it to wiki but Rosa and other distribs can't fix it for the moment.
Comment 11 Andrey Ponomarenko 2015-03-30 17:40:11 MSD

Please, make a probe of your PC: http://wiki.rosalab.ru/en/index.php/Blog:ROSA_Planet/ROSA_Hardware_DB
Comment 12 Eugene Shatokhin 2015-03-31 12:22:34 MSD
Does the problem with brightness keys still persist in ROSA R5?
Comment 13 altadeos 2015-04-03 00:29:48 MSD

here is the probe result:

Comment 14 altadeos 2015-04-03 00:34:12 MSD

The problem with the backlight management seems to be solved by using linux kernel >3.16

I tried some systems with this kernel and there is no problem anymore.
With kernel > 3.16 it's not necessary to add acpi_osi=Linux acpi_backlight=vendor to the grub line. It works out of the box.

With Rosa Fresh R5 the problem is still present. (try with the latest iso in usb mode)

Comment 15 Eugene Shatokhin 2015-04-03 10:20:03 MSD
(In reply to comment #14)
> The problem with the backlight management seems to be solved by using linux
> kernel >3.16
> With Rosa Fresh R5 the problem is still present. (try with the latest iso in
> usb mode)

Thanks for letting us know!

Meanwhile, if you have ROSA R5 installed on that laptop, could you try kernel 3.18.9 there and see if it works out-of-the-box too? 

You may also need to update broadcom-wl as the current release does not build with kernel 3.18.

Here is how to do all this (as root):

urpmi.addmedia kernel-3.18 http://abf-downloads.rosalinux.ru/kernels_3_18x_personal/repository/rosa2014.1/x86_64/main/release/
urpmi.addmedia broadcom-for-3.18 http://abf-downloads.rosalinux.ru/rosa2014.1/container/2474193/x86_64/non-free/release/
urpmi dkms-broadcom-wl
urpmi kernel-nrj-desktop-3.18.9-1rosa kernel-nrj-desktop-devel-3.18.9-1rosa

Then you can reboot the system and see what happens if it runs kernel 3.18.